I know that according to the psak of the Shulchan Aruch the Sephardim (among others -- The Gra, many Kehillas in Yerushalayim including Chassidei Karlin, Chassidei Biyan I think, and Chassidei Chabad (in some cases when there is no shliach tzibbur making the bracha which I believe is their minhag)) don't make a bracha on Hallel (chetzi Hallel) that is said on Rosh Chodesh. While I don't have a specific reason to think otherwise, is the same true for the Hallel that is said on Chol HaMoed Pesach?